I think that it might be usable, at least in some parts of the US or Britain, perhaps more cosmopolitan areas. It's very unusual but more... I don't know what word to use here. Maybe cultured? Not like a kr8yvly spelled band name or anything. I actually like it a lot, and it has some room for nicknames too. You do, however, have the spelling/pronunciation problem with this name, big time.
I would go with Xanthippe Juniper or Xanthippe Ophelia for the combos. Mostly because, in my opinion, such an unusual name is easier with a more "normal" middle name. Ophelia and Juniper still have more character than Jane or Rose-type MNs, but are easier for the general public.
Just a question: is there a particular reason it can't be used in Hungary?